Engine internals

VANOS cam-timing system

Changes when the engine valves open and close.

Drag to turn it Open in the 3D lab
Where it sits

At the camshaft drive ends, with control hardware depending on engine.

How it works

Cam phasing changes valve events relative to the crankshaft to suit load and speed.

Think of it as

Shifting an appointment earlier or later without changing the door’s size.

Symptoms when it fails

Timing faults or weak response may involve oil supply, solenoids, sensors or mechanical timing.

Lifespan

Usually condition-based rather than a routine replacement. Lubrication, overheating and the exact engine affect wear.

Repair cost

Internal-engine work is usually labor-intensive. Diagnosis and the engine code determine the repair scope.

The BMW angle

VANOS is BMW’s variable camshaft-timing system; it is not a turbocharger.

Used in

Equipped BMW petrol engines, including the B38 family documented in BMW technical training. The version and drive hardware vary.

Sources
Same system

Engine internals

Engine blockHolds the cylinders and supports the engine’s rotating parts.Cylinder headCloses the cylinders and carries the valves that control breathing.Cylinder-head gasketSeals combustion pressure, oil and coolant between the block and head.PistonReceives combustion force and moves up and down inside a cylinder.Piston ringsSeal combustion gas and control the oil film on cylinder walls.Connecting rodTransfers piston force to the crankshaft.CrankshaftTurns the pistons’ back-and-forth motion into rotation.Crankshaft main bearingSupports the crankshaft on a controlled film of oil.